Getting morning sunlight through a car windshield or window is ineffective for triggering circadian rhythm mechanisms because the light takes too long to penetrate and by the time sufficient exposure is achieved, the sun has already moved from a low angle to overhead; for proper circadian rhythm regulation, one must get outside into direct sunlight, with window exposure only being a last resort when outdoor exposure is not possible.
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Why Your Commute is RUINING Your Sleep ๐๐ค (Huberman)Added:
Getting your morning sunlight through a window is completely useless. Don't try and get this sunlight exposure through a windshield of a car or a window. It takes far too long. It's simply not going to trigger the relevant mechanisms. You would be standing there all day trying to get enough light into your eyes from the morning sunlight and by then the sun will have already moved from low solar angle to overhead >> [music] >> and it simply won't work for all sorts of mechanisms related to your circadian rhythm functions. Get outside. If the weather is really bad or for whatever reason safety reasons you cannot get outside, well then I suppose try and get near a window. That would be the last last resort, but you really want to get outside to get the sunlight exposure.
And this is exactly why.
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